Foil for ornamenting and printing purposes



Patented Apr. 2, 1929.

UNITED STATES. PATENT OFFICE.-

CARL mmmar'm vou nonssLE Am) wamnanrcnrmt, or nanmzur, REAR mum, GERMANY, assrenoas T cnmnscnn FAIRIK v01! 1mm, or warm..

DRESDEN, GERMANY A CORPORATION OF G FOIL FOB; ORHAMEN'I'ING AND PRINTING IURPOSIS Io Drawing.

This invention relates to transfer sheets and it particularly relates to transfer sheets consisting of a foil made for ornamenting and printing purposes.

'5 Foils for printing, blocking and embossing are generally very brittle and man difliculties arise in using same. More soli foils are obtained by spreading a layer of colour or bronze-powder mixed with an adhesive material on a suitably prepared paper, especially on so-called pergamyn-paper. By the action of the die, the coloured mass separates from the paper and remains on the printed subjects whereas the paper is taken away. It is a disadvantage of this method that the structure of the paper, which had served as a vehicle for the colour, often injures the lustre of the prints and ornaments. Accordingto a process of which one of the applicants, Hermann v. Hoessle, is the inventor, and which is described by the German Letters-Patent 368,274 a much better printing-foil is obtained by using instead of paper as a. vehicle for the colour, 2. film of a cellulose-ester or of h drated cellulose, so-called cellophane. ore brilliant prints are thus obtained owing to the smooth surface of such films and this process is satisfactory in almost all its aspects. A draw-back of these printing films is that it is rather difficult to spread the pigment mixture in a uniform layer upon the smooth surface of the cellulose-film. This uneveness in the thickness of the colored mixture on the film is offering difliculties in so far as an occasionally somewhat thicker layer of colored mass fills the die with an excess of material which subsequently is more heavily pressed by the die than a thinner layer, the

result being that the prints often are defective as the coloured mass in such a case then does not readily separate from the film. Now we have found that we can make a much better transfer sheet for printing or ornamenting purposes if we coat a foil or film made of a smooth, flexible and preferably transparent organic matter, for instance a film of cellulose, a cellulose ester, gelatine, or similar material having inherently polished, glass-like surfaces, with a fine an even coat of a mixture of wax, resin or similar glutinous Application filed August 26, 1929. Serial 181,908.

in the form of a powder, both layers being homogeneously blended, without any mechanical agitation of the same, on the This blending takes place owing-to the dif- M ference in the specific gravity of the materials of the layers blended together. 7 Our new transfer sheet is made by applying to the film first a layer of wax, resins or other glutinom substances by spreading upon the film a solu- .0 tion of suc adhesive, wax-like bodies in organ c solvents, or by distributing the-wax or resins 1n melted condition on the film by brushes or rollers.

substance and of a layer of color or bronze A secondlayer of color or bronze powder is 05 1 now produced on and mixed with the first one. The color or bronze powder may be evenly sprayed on either when suspended in a solu-' tion of resins or other resinous material in benzene, alcohol, or any other suitable orso game solvent, or in the form of a dry powder. The adhesive power of the first layer of wax or the like is brought out -b. treating it with an organic solvent and as t e first layer is thus re-dissolved, the aforesaid solution 1! carrying the heavy powder of color or bronze, mingles with the solution of the first layer, so that the powder of color or bronze becomes embedded therein when the layer becomes dry. In the other case, when the powder of so color or bronze is sprayed on in dry form, the film with the first layer. is slightly heated and the wax or resin, being melted the surface of the film, is then treated with the powder of color or bronze, which sinks into the molten wax or the like so as to be thoroughly and evenly mixed with the same when itbecomes solid again. Thereupon a third layer, con sisting of a solution of shellac, colophonium, artificial resins, bakelite or the like may be applied. Prints made with such printing films are very durable. It is not necessary any more to treat the surfaces on which the impression shall be made with an adhesive material before printing. .5 The die may be cold or warm. No more brushing away of portions which do not belong to the design is necessary. The impres sion obtained is very sharp, for as soon as the pressure of the die as ceased, the film can be mp removed together with all those parts O'll'ltS layer, which have not been used up in the powder.

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The following examples will illustrate the process described above.

Example 1. parts by weight of carnauba-wax, 20 partsby weight of colophonium and 10 parts by weight of bees-wax are dissolved in 700 parts of hot toluene. The solution is finely distributed upon a film of cellulose (cello-f phane). That is effected bypassing the film over a rotating roll dipping 1nto a trough containing said solution, which is heated to about 70 degrees centigrade] The film then passes a heated cylinder until absolutely dry.

An excess of the latter is removed by rotating brushes after the film has cooled off. A third layer is now put on the film by running it over a roll covered with felt which gets continuously soaked with a 15 per cent solution of shellac in alcohol. The film is again dried byja hot rotating cylinder.

. Example 2.

i A cellophane-film covered with a first layer of Wax is treated in a dipping-apparatus with asolution of 20 parts by weight of colophonium in 60 parts of ethyl alcohol,,30 partsot [ether and 30 parts of benzene which has been well mixed with parts by Weight of a red mineral colour. The film is then dried on a hot cylinder. No third layer of shellac is necessary in this case.

Now what we claim is: I

'1. In a transfer sheet the combination comprising a carrier film. of an inherently smooth and non porous structure-less material, a layer of a mass having a. low melting point and a moderate adhesive power, a middle layer of coloring matter eaclrparticle of which is encased in a binding material, and a top layer of amass melting at'a relativelyhigher temperature and having an adhesive power greater than the other fusible mass referred to above.

2. In a transfer sheet the combination comprising a carrier film of an inherently smooth non-porous structure-less material, a layer of a mass having a low melting point and a moderate'adhesive power, a middle layer of coloring matter each particleof which is encased in a binding material melting at a relatively higher temperature and having an adhesive power relatively greater than that of aforesaid layer, and a top layer of a mate rial substantially identical with that of the aforesaid middle layer. 7

3. In a. transfer sheet the combination comprising a carrier film of an inherently-smooth non-porous structure-less material, a layer consisting chiefly of a mixtureofwaxes and to a minor part of colophonium, a middle-layer of coloring matter and a top layer of rosins oi-relatively great adhesive power, encasing the particles of the middle layer.

In testimony whereof we have afiixed our sigi'iatures.

CARL I-IERMANN VON HOESSLE. WALTER RICHTER. 

